Aspen Aerogels, Inc.
US ˙ NYSE ˙ US04523Y1055

SecurityASPN / Aspen Aerogels, Inc.
InstitutionFmr Llc
Latest Disclosed Ownership1,226,073 shares
Ownership 1.50%
Fmr Llc ownership in ASPN / Aspen Aerogels, Inc.

2025-02-12 - Fmr Llc has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 1,226,073 shares of Aspen Aerogels, Inc. (US:ASPN). This represents 1.5 percent ownership of the company. In their previous filing dated 2024-11-12 , Fmr Llc had reported owning 4,050,895 shares, indicating a decrease of -69.73 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File
Date		Effective
Date		Form Prev
Shares		 Latest
Shares		 ΔShares
(Percent)		 Ownership
(Percent)		 ΔOwnership
(Percent)
2025-02-12 2025-02-12 13G/A 4,050,895 1,226,073 -69.73 1.50 -71.46
2024-11-12 2024-11-12 13G 377,281 4,050,895 973.71 5.25 224.78
2016-09-12 2016-09-12 13G/A 2,073,667 377,281 -81.81 1.62 -81.97
2016-02-12 2016-02-12 13G/A 2,079,155 2,073,667 -0.26 8.97 -0.52
2015-11-10 2015-11-10 13G/A 3,336,801 2,079,155 -37.69 9.02 -37.69
2015-09-10 2015-09-10 13G/A 5,296,425 3,336,801 -37.00 14.48 -37.15
2015-04-10 2015-04-10 13G/A 5,296,425 23.04
2015-02-13 2015-02-13 13G/A 6,791,657 29.54
2014-07-10 2014-07-10 13G 6,845,215 29.76

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F ASPEN AEROGELS COM 04523Y105 4,479 -1,290 -22.36 15 -6.25 0.0000
2026-02-17 2025-12-31 13F ASPEN AEROGELS COM 04523Y105 5,769 -894 -13.42 16 -65.22 0.0000
2025-11-13 2025-09-30 13F ASPEN AEROGELS COM 04523Y105 6,663 -162,545 -96.06 46 -95.40 0.0000
2025-08-14 2025-06-30 13F ASPEN AEROGELS COM 04523Y105 169,208 -1,047,932 -86.10 1,002 -87.13 0.0001
2025-05-12 2025-03-31 13F ASPEN AEROGELS COM 04523Y105 1,217,140 -8,933 -0.73 7,778 -46.60 0.0005
2025-02-13 2024-12-31 13F ASPEN AEROGELS COM 04523Y105 1,226,073 -2,824,823 -69.73 14,566 -87.02 0.0009
2024-11-13 2024-09-30 13F ASPEN AEROGELS COM 04523Y105 4,050,896 773,647 23.61 112,169 43.51 0.0068
2024-08-13 2024-06-30 13F ASPEN AEROGELS COM 04523Y105 3,277,249 899,168 37.81 78,162 86.75 0.0050
2024-05-13 2024-03-31 13F ASPEN AEROGELS COM 04523Y105 2,378,081 49,944 2.15 41,854 13.93 0.0028
2024-02-13 2023-12-31 13F ASPEN AEROGELS COM 04523Y105 2,328,137 48,960 2.15 36,738 87.44 0.0028
2023-11-13 2023-09-30 13F ASPEN AEROGELS COM 04523Y105 2,279,177 -39,634 -1.71 19,601 7.13 0.0017
2023-08-11 2023-06-30 13F ASPEN AEROGELS COM 04523Y105 2,318,811 -15,726 -0.67 18,295 5.19 0.0015
2023-08-11 2023-03-31 13F/A-1 ASPEN AEROGELS COM 04523Y105 2,334,537 52,898 2.32 17,392 -35.35 0.0016
2023-05-11 2023-03-31 13F ASPEN AEROGELS COM 04523Y105 2,334,537 52,898 17,392 0.0016
2023-02-13 2022-12-31 13F ASPEN AEROGELS COM 04523Y105 2,281,639 1,716,501 303.73 26,901 416.22 0.0027
2022-11-10 2022-09-30 13F ASPEN AEROGELS COM 04523Y105 565,138 95,893 20.44 5,211 12.40 0.0005
2022-08-12 2022-06-30 13F ASPEN AEROGELS COM 04523Y105 469,245 -66,922 -12.48 4,636 -74.92 0.0005
2022-05-13 2022-03-31 13F ASPEN AEROGELS COM 04523Y105 536,167 -196,589 -26.83 18,488 -49.33 0.0015
2022-02-14 2021-12-31 13F ASPEN AEROGELS COM 04523Y105 732,756 157,931 27.47 36,484 37.95 0.0027
2022-02-14 2021-09-30 13F/A-1 ASPEN AEROGELS COM 04523Y105 574,825 54,415 10.46 26,448 69.87 0.0021
2021-11-15 2021-09-30 13F ASPEN AEROGELS COM 04523Y105 574,825 54,415 26,448 0.0004
2021-08-13 2021-06-30 13F ASPEN AEROGELS COM 04523Y105 520,410 100,110 23.82 15,570 82.13 0.0012
2021-05-14 2021-03-31 13F ASPEN AEROGELS COM 04523Y105 420,300 420,300 8,549 0.0007
2017-02-10 2016-12-31 13F ASPEN AEROGELS COM 04523Y105 0 0 0 0.0000
2016-11-14 2016-09-30 13F ASPEN AEROGELS COM 04523Y105 0 -1,450,494 -100.00 0 -100.00
2016-08-11 2016-06-30 13F ASPEN AEROGELS COM 04523Y105 1,450,494 -571,632 -28.27 7,209 -20.78 0.0010
2016-05-16 2016-03-31 13F ASPEN AEROGELS COM 04523Y105 2,022,126 -51,541 -2.49 9,100 -27.70 0.0013
2016-02-12 2015-12-31 13F ASPEN AEROGELS COM 04523Y105 2,073,667 -165,852 -7.41 12,587 -25.06 0.0017
2015-11-10 2015-09-30 13F ASPEN AEROGELS COM 04523Y105 2,239,519 -2,717,173 -54.82 16,796 -48.81 0.0024
2015-08-25 2015-06-30 13F/A-1 ASPEN AEROGELS COM 04523Y105 4,956,692 -339,733 -6.41 32,813 -14.90 0.0042
2015-08-13 2015-06-30 13F ASPEN AEROGELS COM 04523Y105 4,956,692 32,813
2015-05-14 2015-03-31 13F ASPEN AEROGELS COM 04523Y105 5,296,425 -1,495,232 -22.02 38,558 -28.86 0.0049
2015-02-17 2014-12-31 13F ASPEN AEROGELS COM 04523Y105 6,791,657 -53,558 -0.78 54,197 -21.45 0.0071
2014-11-14 2014-09-30 13F ASPEN AEROGELS COM 04523Y105 6,845,215 0 0.00 69,000 -8.78 0.0093
2014-08-14 2014-06-30 13F ASPEN AEROGELS COM 04523Y105 6,845,215 6,845,215 75,640 0.0101
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.